/Engine/Plugins/Compositing/Composure/Source/Composure/Public/CompositingElements/CompositingMaterialPass.h
Set the overrideUTexturevalue for the named input material parameter
void SetTextureOverride ( const [FName](API\Runtime\Core\UObject\FName) ParamName, [UTexture](API\Runtime\Engine\Engine\UTexture) * ParamVal )